package test;

public class Main {
    static void print(int[] a, int index) {
        for (int i = 0; i < a.length - 1; i++)
            System.out.print(a[i] + ", ");
        System.out.println(a[a.length - 1]);
        for (int i = 0; i < a.length; i++) {
            int k = 1, t = a[i];
            if (t>=0) {} else {t=-t; k++;}
            while ((t = t / 10) > 0)
                k++;
            StringBuilder sb = new StringBuilder("");
            while (k-- > 0)
                sb.append(" ");
            String s = sb.toString();
            System.out.print(i == index ? "^" + s + " " : s + "  ");

        }
        System.out.println();
    }

    static int delta(int x1, int x2) {
        return Math.abs(x1 - x2);
    }

    static void find(int[] a1, int[] a2) {
        int[] min = new int[3];
        min[0] = delta(a1[0], a2[a2.length - 1]) > delta(a1[a1.length - 1], a2[0]) ? delta(a1[0], a2[a2.length - 1])
                : delta(a1[a1.length - 1], a2[0]);
        for (int i = 0; i < a1.length; i++)
            for (int j = 0; j < a2.length; j++)
                if (delta(a1[i], a2[j]) <= min[0]) {
                    min[0] = delta(a1[i], a2[j]);
                    min[1] = i;
                    min[2] = j;
                }
        print(a1,min[1]);
        print(a2,min[2]);
        System.out.println("n");
        System.out.println("Result delta = "+min[0]);
    }

    public static void main(String[] args) {
        int[] a1 = { 1, 4, 8, 12, 18, 328, 99482}, a2 = {35, -27, 325, 9482};
        find(a1, a2);
    }
}

out:
1, 4, 8, 12, 18, 328, 99482
                 ^
35, -27, 325, 9482
         ^


Result delta = 3